Will dealers still be able to sell their stocks of direct heaters after 1 January 2018, even if they do not comply with the ErP directive?

Yes, remaining stocks may still be sold, but they may not be re-ordered. There is no risk for the dealer because the ErP is an obligation imposed on the manufacturer. STIEBEL ELTRON has revised its entire range of electric room heating appliances, and as of 1 January 2018 will only supply ErP-compliant products.